Metal heading machine



Nov. 29, 1932. J. E. PRACNY 1,839,904

METAL HEADING MACHINE Filed May 27, 1951 5 Sheets-Sheet l Nov. 29,1932., J. E. PEACNY METAL HEADING MACHINE Filed May 27, 1931 5SheetsSheet Nave 29, 1932. A N 1,889,004

METAL HEADING MACHINE Filed May 27, 1951 5 Sheets-Sheet 3 I PatentedNov. 29, 1932 UNITED PATENT OHN PRAG Y. WATERBUBY, CONNECTICUT,,AssIenon To T aNvI Ln MACHINE GQMPANY, F w wEBaUt-Y c w-swam A CQRrQMIQN F N- nnorrrcur METAL am ne Application filed May 27,

This invention relates to open die metal heading machines. In suchmachines as commonly constructed the dies are opened, wire is fedlongitudinally in between the dies, the dies are closed on the wire andmove transversely so as to cut off a blank and present it in headingposition, a punch moves up and swages the projecting end of the blankand then withdraws, the dies are then retracted to feeding position andopened and the head ed blank pushed longitudinally out by incoming wire.These machines are large, heavy and expensive, and they require a punchstroke which is longer than the length of the i headed blank as thepunch must be withdrawn sufficiently for the headed blank to be ejectedlongitudinally from the dies, which adds to the cost of the machine andlowers the output owing to the time required for the punch travel.

The object of the present invention is to provide headers of this classwith means whereby they may be used for heading blanks which are longerthan the travel of the punch, and thus allow longer blanks to be headedon machines originally designed for shorter blanks, and also admit of anincrease of speed as the travel of the punch may be reduced.

In accomplishing the object, the machine is provided with means whichetfectsa necessary control of the separation of the dies, and also meanswhich co-operates therewith to ensure the ejection of the headed blankstransversely down between the dies to. an opening in the die pocket,instead of pushing them longitudinally from the dies as is the usualway.

Only so much of a conventional machine is illustrated as is necessary tounderstand the application thereto of the present invention.

In the accompanying drawings Fig. 1 shows a plan of .a machine framewith the die retarding and blank ejecting mechanisms applied thereto.Fig. 2 shows an elevation of the .side of the machine frame on which theblank ejecting mechanisms are mounted. Fig. 3 shows an elevation of theside of the machine on which the die retarding mechanisms are mounted.Fig. 4 is a transverse section across the frame looking toward the 1931.Serial No. 54o, 22 5.

dies which are shown in closed position. Fig. 5 is a similar view withthe dies inopen position. Fig. 6 shows a section of the die cap andejecting plate and the face of a die. Fig. 7 shows an end view of theopened dies and the ejecting plate. Fig. 8 shows an edge View of theejecting plate, at the end of a die. Fig. 9 is an end view of the closeddies and the retaining pin. Fig. 10 is a horizontal section showing thedie actuating mechanisms. Fig. 11 is a horizontal section through thedies, which are in heading position. i

The dies 1 and 2, with the required filling blocks 3, are located in thedie pocket 4 and are held down by a die cap 5 and from pulling out bythe face plate .6, in the usual way.

The die 1 is connected by a yoke 7 with the head 8 of the plungers 9that are moved in and out by the toggles 10 actuated by the slide 11which is reciprocated by link and lever connections with cams or crankson the main shaft 12, in the Well-known manner.

The .die'2 is normally pressed toward the die 1 by the head 13 of theplunger 14; under the thrust of the spring 15 secured to the side of theframe. On the outer end of this die plunger 14 is ahead 16 with abeveled face that is adapted to be engaged by the beveled end of a bolt17 which is movably mounted in a bracket 18 fastened to the side of themachine frame. This bolt is connected by a link 19 to a lever 20 whichis keyed to one end of a shaft 21 that issupported'by brackets 22 on theunder side of the frame. On the opposite end of .this shaft 21 is arocker arm 23 with a roll 24 which rides under a cam plate 25 secured tothe bottom of the gate 26 which carries the punch 27. The gate isreciprocated in the usual manner in machines of this type. A spring 28,which extends along the side of the frame, thrusts against the upper endof the lever 20 and causes the roll 24 to bear against the cam plate 25.

As the gate recedes after heading a blank, the cam plate 25 engaging theroll 24 turns the shaft 21 and causes the lever 20 to withdraw the bolt17 from engagement with the end of the die plunger 14. The plunger isthen free to be moved inward by the spring 15 andcause the die 2tofollow thedie 115mm heading position to feed position. This mechanismprevents the die 2 from being pushed over by the spring for a shortperiod after the blank is headed and while the punch is 5 receding andthe die 1 is being retracted. In order to prevent the die 2 fromfollowing the die 1 during this period, as a result of suction or anyother cause, pins 31 with tapered lower ends 32 are loosely mounted inthe die cap 5 so that the lower tapered ends will engage the edge of thedie 2. These pins are normally pressed down by springs 33 on the diecap. After the die 1 has been moved a short distance from the die 2 andthe bolt 17 1b is withdrawn from the die plunger, the spring 15011 theoutside of the frame forces the die 2 over against the die 1, the pinsyielding to permit this.

On a bracket 34 on the side of the machine frame near the rear end, is astud 35 with an angle lever 36 which at one end has a roll 37 thatengages with a cam 88 on the main shaft 12. The stud 35 also has a lever39 that is connected by a link 40 to an angle lever 41 which isfulcrumed on a stud 4L2 projecting upwardly from the gate cap 43. In theother end of this lever 41 is a vertically movable knuckle stud 44:which has a globular head 45 that is fitted in the upper end of a leverso, 4-6 mounted on a stud 17 projecting from the front face of the diecap 5.

The lower end of the lever 46 engages a stripper plate 18 that ismovable vertically in a way in the face plate 6. The stripper is presseddownward by the action of a spring 49 tensioned between a lug 50 on theframe and the lever 41, and it is moved upward by the action of the cam38 through the connec tions mentioned. The bottom edge of the an)stripper has a recess 51 with beveled sides shaped to engage and wedge ablank loose if it adheres to either of the dies, so the blank will dropthrough the opening 52 in the bottom of the die pocket.

453 The members of this mechanism are so timed that after a length ofwire has been fed in between the dies both of the dies are movedtogether from feed position to heading position, and the blank cut fromthe wire is 503 headed by the forward movement of the punch; As thepunch is retracted the positive die 1 is withdrawn toward feed position,and for a short period while these movements are taking place the freedie 2 is retained in 1 heading position by the engagement of theretarding bolt with the die plunger. During this interval the ejectorblade is moved downward for freeing the blank from the die cavities, ifit has not already dropped. Then as the gate recedes further the cam onits under side causes the retarding latch to release the plunger so thatthe free die will be pushed overuby its spring against the other die infeed position. With this means without 5 lengthening out the frame of amachine or increasing the punch stroke, which often in the past has beenrequired for heading extra long blanks, long bolts may be rapidl headed.

The invention claimed is:

1. A metal heading machine of the character described havingcomplementary dies movable transversely in a die pocket that has adischarge opening in its bottom wall, means for positively moving onedie between feeding position and heading position, spring actuated meansfor moving the other die from heading position to feeding position,means for temporarily restraining the movement of the latter die for ashort interval as the former die is being withdrawn from headingposition, and means having a recess with beveled edges movabletransversely of and across the ends of the die cavities during theinterval said die is being restrained, for wedging free and releasingany blank that has adhered to either die.

2. A metal heading machine of the character described havingcomplementary dies movable transversely in a die pocket that has adischarge opening in its bottom wall, means for positively moving onedie between feeding position and heading position, spring actuated meansfor moving the other die from heading position to feeding position,means for temporarily restraining the movement of the latter die for ashort interval as the former die is being withdrawn from headingposition, and means movable in a channel across the ends of the diestransversely of the die cavities during the interval said die is beingrestrained, for releasing any blank that has adhered to either die.

3. A metal heading machine of the character described havingcomplementary dies movable transversely in a die pocket that has adischarge opening in its bottom wall, toggle means for positively movingone die between feeding position and heading position, a spring actuatedplunger for moving the other die from heading position to feedingposition, a bolt for temporarily restraining the action of said plungerfor a short interval as the former die is being withdrawn from headingposition, and a plate movable in a channel vertically across the ends ofthe dies, transversely of the die cavities, during the interval saidplunger is being restrained, for releasing any blank that has adhered toeither s1 e.

l. A metal heading machine of the character described havingcomplementary dies movable transversely' in a die pocket that has adischarge opening in its bottom wall, means for positively movin one diebetween feeding position and hea ing position, a

spring for moving the other die from heading position to feedingposition, means for temporarily restraining the action of said springfor a short interval as the former die is being Withdrawn from headingposition, and means movable transversely of and across the ends of thedie cavities during the interval said spring actuated die is beingrestrained, for releasing any blank that has adhered to either die.

5. A metal heading machine of the character described havingcomplementary dies movable transversely in a die pocket that has adischarge opening in its bottom Wall, means for positively moving onedie between feedin position and heading position, a spring for movingthe other die from heading position to feeding position, means fortemporarily restraining the action of said spring for a short intervalas the former die is being Withdrawn from heading position, frictionmeans retaining the spring actuated die from following the positivelyactuated die While the spring is restrained, and Wedging means movablevertically across the ends of the dies transversely of the die cavitiesduring the interval said spring actuated die is being restrained, andadapted to engage the headed end of any blank that has adhered to eitherdie.

JOHN E. PRACNY.

